Internal combustion engine cooling system



Aug. 18, 1931. H. DUNKELMANN 1,819,744

INTERNAL COMBUSTION ENGINE COOLING SYSTEM Filed May 17, 1930 2Sheets-Sheet 1 Aug. 18, 1931. H. DUNKELMANN INTERNAL COMBUSTION ENGINECOOLING SYSTEM Filed May 17. 1930 2 Sheets-Sheet 2 Ill Patented Aug. 18,1931 1 UNITED STATES HANS DUNKELMANN, OF KIEL, GERMANY, WERFTAKTIENGESELLSCHAFT,

assrenon r FRIED. KRUPP (mammor KIEL-GAARDEN, GERMANY\ INTERNALCOMBUSTION ENGINE COOLING SYSTEM Application filed May 17, 1930, SerialNo.

The invention relates to the conduction of the cooling water in thecylinder covers of internal combustion engines, in which covers twoannular cooling water chambers are I; provided that are separated fromone another by a partition, the one of these chambers serving to receivefirst and distribute the cooling water while the other chamber efi'ectsthe cooling action proper on the cylinder cover. The invention consistsin the fact that the partition has passages uniformly distributed on itsouter circumference and the total sectional area of which is notablysmaller than the sectional area of 1 the outlet attached to the centralportion of the inner cooling chamber, so that a considerable drop ofpressure is obtained between the two cooling water chambers.

In order that the invention can be more readily understood, anembodiment of the same is illustrated by way of example in theaccompanying drawings in which vFigure 1 is a vertical central sectionthrough a cylinder cover fitted with the new arrangement,

Figure 2 is a vertical section through one of the cylinders of aninternal combustion engine, on a reduced scale, and

Figure 3 is an external side View corresponding to Figure 2.

Referring first to Figure 1, A denotes the cylinder cover which includestwo cencentrical annular cooling water chambers B and C separated fromone another by a partition D of angular cross section. The cooling waterenters chamber B through an inlet pipe E and from there passes through aplurality of passage openings F to the inner cooling chamber C. It flowsoff from the latter through an outlet pipe G. The chamber B is arrangedin the cylinder cover A in such a manner that the water therein does notserve to immediately cool the hot portions of the cover, but thatchamber B serves only as a storage tank for a greater quantity ofcooling water, Whilst the cooling action proper upon the cover bottom Hturned toward the combustion chamber, and upon the central valve castingis efiected by the cooling water in the annular cooling 453,301. and inGermany May 27, 1929.

chamber C. Now in order to obtain a uniform passage of the cooling waterfrom chamber B to chamber C and a satisfactory distribution thereof onthe latter several openings F are provided in the partition D for thepassage of thecooling water which openings are uniformly distributed onthe circumference of partition D. The total passage area of the openin sF is smaller than that of the outlet pipe In this manner the coolingwater flowing through the openings F is dammed up in chamber B and anotable drop of pressure is produced between chambers B and C.Consequently practically equal quantities of water pass through allopenings F and flow radially toward the center of cover A over thebottom H, which is the surface to be cooled. By a suitable distributionof the openings F therefore uniform cooling of the bottom H, facing thecombustion chamber, of cover A, and of the valve casing is obtained.Without the provision of this damming effect and drop of pressureresulting therefrom, the water fed to chamber B would substantiallyvflow to chamber C through that opening F which is the next to theadmission pipe E, so that the bottom H of the cover would not be cooleduniformly. This would result in objectionable heat stresses in thematerial and with possibilities of fracture of the cover.

Plugs J screwed into cover A project with their smooth ends into thebored openings F so as to throttle the passage area of the latter toenable suitable regulation of the drop of pressure to an extentdepending on the diameter of the plugs J. Owing to the provision ofthese plugs the passages F have the shape of annular passages whichprevent passage of greater foreign bodies, this being an advantage oversimple bores of circular cross section.

The heat quantities to be led off by the cooling water in an internalcombustion engine are particularly great relatively to the area unit ofthe cylinder cover. Consequently, besides a uniform distribution of thecooling water on the bottom H of the cover, the highest possiblevelocity of flow of the water is required. In order to obting thecooling'water from at least two of tain such a high velocity of flow, aconsiderably greater quantity of cooling water has to be fed to thecylinder cover in the time unit than to the cylinder jackets of theengine. This greater supply is achieved according to the invention in asimple manner by the cooling water flowing through the jackets of atleast two cylinders in parallel connection and then through theappurtenant cylinder covers in series connection.

Figures 2 and 3 illustrate this manner of conducting the cooling water.Here the water fiows through the admission pipe K to the cylinder jacketL and through admission pipe K to the other cylinder jacket L Whenleaving the jackets L and L through the pipes M and M these two watercurrents are united in a common pipe leading to the one cylinder cover Aand thereupon to cover A, that is in series connection.

I claim 1. An internal combustion engine having a cylinder coverincluding a cooling water fore-chamber and a cooling water chamberproper, a water inlet on said fore-chamber and a water outlet on saidcooling chamber proper, said two chambers intercommunicating by aplurality of uniformly distributed passages the total area of which issmaller than that of said water outlet.

2. An internal combustion engine having a cylinder cover including acooling water fore-chamber and a cooling water chamber proper, a waterinlet on said fore-chamber and a water outlet on said cooling chamberproper, said two chambers intercommunicating by a plurality of uniformlydistributed passages the total area of which is smaller than that ofsaid water outlet, and externally controlled means for varying the areaof said passages.

3. An internal combustion engine having a cylinder cover including acooling water fore-chamber and a cooling water chamber proper, a waterinlet on said fore-chamber and a water outlet on said cooling chamberproper, said two chambers intercommunicating by a plurality of uniformlydistributed passages the total area of which is smaller than that ofsaid water outlet, and plugs adapted to be adjusted from outside and toproject into said passages.

4. A multicylinder internal combustion engine having cylinder coverseach including a cooling water fore-chamber and a cooling water chamberproper, a water inlet on said fore-chamber and a water outlet on saidcooling chamber proper, said two chamhers intercommunicating by aplurality of uniformly distributed passages the total area of which issmaller than that of said water said water jackets to one of theappurtenant cylinder covers and from the latter to the other appurtenantcylinder cover.

The foregoing specification signed at Hamburg, Germany, this 3rd day ofMay,

HANS DUN KELMAN N outlet, a water jacket on each cylinder, means forseparately feeding cooling water to each water jacket, means forcommonly conduct- Ill.)

